Personal data of innocent citizens must be made available to the Government to combat terrorism, according to an influential former security chief.

Sir David Omand, Whitehall’s former and security and intelligence coordinator, called for unprecedented Big Brother powers to allow access to private details - including phone records, emails and travel information - to be given to the intelligence services.

Setting out a hugely controversial blueprint for the future of national security he said ‘moral rules’ about individual privacy would have to be broken.